JP2013190087A - Branch opening communicating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a branch opening closing method by which a branch is effectively utilized and accumulation of a fluid in the branch is prevented.SOLUTION: A branch opening communicating method can communicate a branch opening 12b of a branch 12, which is closed by a closing body 3, in an uninterrupted flowing state in a casing 2 having the branch 12 for communicating with a drilled hole Q mounted in a tightly sealed state on a fluid pipe 1 having the drilled hole Q. A case 35 communicating with the branch 12 is tightly mounted. After the closing body 3 is removed through the case 35, a closing body 4 having a communicating hole 4a communicating with an inside and outside of the branch 12, in place of the closing body 3, is mounted so that an abutting part on the branch 12 is in a tightly sealed state through the case 35. Thus, a connection member 6 for opening and closing the communication hole 4a can be mounted on the communication hole 4a.

Description

  The present invention relates to a casing having a branch portion that is hermetically attached to a fluid pipe having a perforation and communicates with the perforation, wherein the branch opening of the branch portion is closed by a closing body. It is related with the branch opening communication method which makes communication possible in.

  In the case with the conventional branch part, the outer periphery of the water pipe (fluid pipe) where the water stop is to be covered is covered with a basic support member, and a through hole ( There is a type in which a predetermined operation is performed from this through hole. After that, a water-sealing hole unit composed of a disk-shaped support and a closing member is mounted in the cylindrical portion, and the cylindrical portion and the through hole are closed in a water-tight manner, thereby projecting larger than the outer periphery of the water pipe. Since it is not buried, for example, there is one that prevents the possibility of being damaged by being caught with a power shovel or the like during other water pipe construction (for example, see Patent Document 1).

JP 2008-157353 A (4th, 5th and 6th pages, FIG. 2)

  However, in Patent Document 1, the water-sealing hole unit has only a function of closing the cylindrical portion and the through hole, and the cylindrical portion cannot be effectively used. Furthermore, there is a problem that the fluid that flows out during the hole closing operation stays in the space between the disk-shaped support and the hole closing member, which is not hygienic.

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide a branch opening closing method that can effectively use a branch portion and does not cause fluid to stay in the branch portion.

In order to solve the above-mentioned problem, the branch opening communication method of the present invention comprises:
In a casing having a branch portion that is hermetically attached to a fluid pipe having a perforation and communicates with the perforation, the branch opening in which the branch opening is closed by a closing body can be communicated in an uninterrupted state. A branch opening communication method,
A case body that communicates with the branch portion is attached in a sealed manner, and after the closure body is removed through the case body,
In place of the closing body, a closing body having a communication hole communicating with the inside and outside of the branching portion is attached via the case body so that a contact portion is sealed with respect to the branching portion. Thus, a connection member capable of opening and closing the communication hole can be attached to the communication hole.
According to this feature, the closure body includes a communication hole, and a connection member that can open and close the communication hole is attached, so that, for example, an air valve, a repair valve, Fire hydrants, ball valves, etc. can be connected as appropriate, the branch part of the housing can be used effectively, and the fluid is not retained in the branch part by opening and closing the communication hole by the connecting member. it can.

The branch opening communication method of the present invention is:
The closing body has an annular rust prevention portion that is in contact with the perforation, and is attached to the branch opening, and the perforation is rusted by the rust prevention portion.
According to this feature, since the closure body has a rust prevention portion, it is possible to prevent the formation of rust on the perforations and to branch the closure body without performing a separate step of preventing the perforations from being rusted. Since the perforation is prevented at the same time as attaching to the opening, the work can be simplified.

The branch opening communication method of the present invention is:
The perforation surface of the perforation is cut before the perforation is rust-prevented.
According to this feature, cutting the perforated surface of the perforation before rust prevention of the perforation can prevent the new perforated surface from removing rust and impurities, and keep the inside of the fluid pipe clean. Can do.

The branch opening communication method of the present invention is:
After the closure body is attached to the branch portion, it is locked by a locking portion of the branch portion.
According to this feature, the closure body is positioned by providing the locking portion at the branch portion, and the state where the closure body is installed can be maintained.

(A) is front sectional drawing which shows the state by which the branch opening was closed by the closure body in Example 1, (b) is also a sectional side view similarly. It is front sectional drawing which shows the state which has removed the closing body in Example 1. FIG. It is front sectional drawing which shows the state which attaches the obstruction body in Example 1 to a branch part. It is front sectional drawing which shows the state which the obstruction body in Example 1 obstruct | occluded the branch opening. It is front sectional drawing which shows the state which attaches the obstruction body in Example 2, 3 to a branch part. It is front sectional drawing which shows the state which the obstruction body in Example 2, 3 obstruct | occluded the branch opening. (A) is front sectional drawing which shows the state which has removed the closing body in Example 3 from a branch part, (b) is the state which is cutting the drilling surface of a piercing | piercing after removing a closing body. It is front sectional drawing shown. It is front sectional drawing which shows the state which attaches the obstruction body in Example 4 to a branch part. It is front sectional drawing which shows the state which removes the plug member after attaching the obstruction body in Example 4. FIG. It is front sectional drawing which shows the state which attached the fire hydrant to the obstruction body in Example 4. (A) is front sectional drawing which shows the state by which the branch opening was closed by the closing body in Example 5, (b) is front sectional drawing which shows the state which has removed the closing body from the branch part. (A) is front sectional drawing which shows the state which attaches the obstruction body in Example 5 to a branch part, (b) is front sectional drawing which shows the state which obstruction body obstruct | occluded the branch opening.

  EMBODIMENT OF THE INVENTION The form for implementing the branch opening communication method which concerns on this invention is demonstrated below based on an Example.

  The branch opening communication method according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the fluid pipe 1 of the present embodiment is made of, for example, ductile cast iron for waterworks buried in the ground, is formed in a substantially circular shape in cross section, and the inner peripheral surface is covered with a mortar layer Has been. The fluid pipe according to the present invention may be made of other metals such as cast iron and steel, or made of asbestos, concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. Further, in the present embodiment, the fluid in the fluid pipe 1 is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water, and may be industrial water, for example, or a gas or gas-liquid mixture It may be a fluid pipe through which a fluid in a state flows.

  The casing 2 attached in a sealed manner to the outer peripheral surface of the fluid pipe 1 is a so-called split T-shaped pipe, and extends in a direction substantially orthogonal to the pipe axis of the fluid pipe 1 and is perforated by the fluid pipe 1. A first housing 11a that includes a branch portion 12 that communicates with Q and covers the upper side of the outer periphery of the fluid pipe 1; and a second housing 11b that covers the lower side of the outer periphery of the fluid pipe 1. The casing 11 a and the second casing 11 b are opposed to each other at a position sandwiching the fluid pipe 1, and are fastened by bolts and nuts 13. In addition, a rubber ring 22 is provided on the outer periphery of the perforation Q between the inner surface of the branching portion 12 and the outer surface of the fluid pipe 1, and fluid leakage from the fluid pipe 1 is prevented via the perforation Q. ing.

  An existing valve lid 3 which is a closing body in the present invention for closing the branch opening 12b of the branch portion 12 is attached to the branch portion 12, and the valve lid 3 moves forward and backward toward the perforation Q. A valve body 5 for opening and closing the inside of the fluid pipe 1 through the perforation Q is provided. The valve lid 3 has an outer diameter that is smaller than the inner diameter of the upper end portion of the branch portion 12, and an O-ring 19 is provided along the outer periphery of the lower portion of the valve lid 3. By providing the O-ring 19 along the outer periphery of the lower portion of the valve lid 3, the O-ring 19 is fitted and inserted along the inner peripheral surface of the branch portion 12. Furthermore, it is locked by a fixing bolt 16 screwed into the inner diameter direction from the upper flange 12a of the branching portion 12, and is arranged so that a ring-shaped flange 9 is engaged with the outer peripheral surface of the valve lid 3. The positions of the flange 9 and the upper flange 12a are fixed by being fastened by bolts and nuts 14.

  Next, a branch opening communication method that enables the branch opening 12b of the branch portion 12 closed by the valve lid 3 to communicate in an uninterrupted state will be described.

  First, as shown in FIG. 2, a work valve case 35, which is a case body according to the present invention in which a work valve 36 is disposed, is connected to the upper flange 12 a of the branch portion 12 in a sealed manner. An outer case 37 in which an insertion machine 38 that can be advanced and retracted toward the branching portion 12 is disposed is attached above 35. Then, the valve lid 3 is connected to the distal end of the insertion machine 38 and the fixing bolt 16 is screwed out from the valve lid 3 to retreat the insertion machine 38, and the valve lid 3 is connected to the valve lid 3 from the branch portion 12 via the work valve case 35. Remove.

  Next, as shown in FIG. 3, the work valve case 35 is closed by the work valve 36, and a communication hole 4 a communicating with the inside and the outside of the branching portion 12 is provided instead of the valve lid 3. The closing body 4 is attached to the tip of the insertion machine 38. In this embodiment, the closing body 4 has a slightly smaller diameter than the inner diameter of the upper end portion of the branching portion 12 and has a substantially circular shape in plan view. In addition, the outer peripheral surface of the closing body 4 is formed with a concave portion 4b in which the tip of the fixing bolt 16 is locked and a seal ring 4c for sealing the branch opening 12b. Further, the communication hole 4a of the closing body 4 has an inner peripheral surface formed in a female screw shape, and an air valve 6 which is a connecting member of the present invention capable of opening and closing the communication hole 4a is screwed onto the communication hole 4a.

  Thereafter, the closing body 4 to which the air valve 6 is attached is attached in the branch portion 12 by moving the insertion machine 38 forward. At this time, the fluid flowing in from the fluid pipe 1 is discharged into the outer case 37 through the hose 39 branched from the branching portion 12, and the branching portion 12 side and the outer case 37 side with the work valve 36 as a boundary are isobaric. Therefore, the insertion of the closing body 4 by the insertion machine 38 is easy.

  According to this, the closing body 4 includes the communication hole 4a, and the connection member capable of opening and closing the communication hole 4a is attached, so that the air valve 6 can be used as the connection member in accordance with the usage at the position where the housing 2 is disposed. It is possible to connect appropriately, the branch part 12 of the housing 2 can be used effectively, and the air valve 6 opens and closes the communication hole 4a so that the fluid does not stay in the branch part 12. it can.

  In the state in which the closing body 4 is mounted in the branching portion 12, as shown in FIG. 4, the seal ring 4c of the closing body 4 is pressed against the inner peripheral surface of the branching portion 12, and the branch opening 12b is closed in a sealing manner. Becomes to be. Thereby, the fluid which flows into the branch part 12 from the perforation Q does not leak from the branch opening 12b. Next, the fixing bolt 16 is screwed into the recess 4b to lock the closing body 4. That is, the fixing bolt 16 constitutes the locking portion of the present invention. In this manner, the closing body 4 is positioned by providing the fixing bolt 16 as the locking portion described above on the upper flange 12a of the branching portion 12. That is, the state where the branch opening 12b is closed in a sealed manner by the closing body 4 is maintained. After that, by attaching the annular presser lid 10 to the upper flange 12a of the branch portion 12 with bolts and nuts, it is possible to prevent foreign matter from entering the branch portion 12 or the closure body 4 from coming out of the branch portion 12.

  In the state of FIG. 4, the air valve 6 that is a connecting member of the present invention always discharges the air accumulated in the branching portion 12 to the outside when the operation portion 6 a of the repair valve connected to the air valve 6 is normally open. be able to. When the valve lid 3 and the valve body 5 are used again, the closing body 4 and the air valve 6 can be easily replaced in an uninterrupted state by performing the same process as described above.

  As described above, in the housing 2 having the branch portion 12 which is attached to the fluid pipe 1 having the perforation Q in a sealed manner and communicates with the perforation Q, the branch opening 12b of the branch portion 12 is closed by the valve lid 3. A branch opening communication method for allowing the branch opening 12b to be communicated in an uninterrupted state, wherein a work valve case 35 communicating with the branch portion 12 is attached in a sealed manner, and the valve lid 3 is removed via the work valve case 35 After that, instead of the valve lid 3, the closing portion 4 provided with the communication hole 4 a communicating with the inside and the outside of the branch portion 12 is sealed to the branch portion 12 through the work valve case 35. By attaching so as to become, the connecting member capable of opening and closing the communication hole 4a can be attached to the communication hole 4a. According to this, the closing body 4 includes the communication hole 4a, and the connection member capable of opening and closing the communication hole 4a is attached, so that, for example, an air valve, A repair valve, a fire hydrant, a ball valve, and the like can be connected as appropriate, the branch portion 12 of the housing 2 can be used effectively, and fluid can be introduced into the branch portion 12 by opening and closing the communication hole 4a by the connecting member. Can be prevented from staying.

  Next, a branch opening communication method according to the second embodiment will be described with reference to FIGS. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted.

  In the branch opening communication method of the present embodiment, the structure of the closing body 40 is different from that of the first embodiment. That is, as shown in FIGS. 5 and 6, the closing body 40 of this embodiment has a rust prevention portion 41 extending toward the perforation Q. The rust prevention portion 41 includes an annular cylindrical body 41a extending toward the perforation Q, and an inner periphery of the perforation Q where the metal base of the fluid pipe 1 is exposed on the outer peripheral surface of the tip of the cylindrical body 41a. And a rust preventive member 41b that abuts over the surface. The tubular body 41a has a through hole 41c that penetrates in the radial direction of the tubular body 41a. The rust prevention member 41b is made of a member having elasticity, such as styrene butadiene rubber.

  As shown in FIGS. 5 and 6, the closing body 40 is attached to the branch portion 12 and the branch opening 12 b is sealed in a sealed manner by the same process as in the first embodiment. At this time, as described above, the rust prevention portion 41 extends from the closing body 40 toward the perforation Q, so that the branch opening 12b is sealed in a sealed manner, and the rust prevention member 41b of the rust prevention portion 41 is perforated. The perforation Q is rust-proofed by contacting over the inner peripheral surface of Q.

  As described above, since the closing body 40 has the rust prevention portion 41, it is possible to prevent the perforation Q from being rusted, and the closing body 40 can be removed without performing a separate step of preventing the perforation Q from being rusted. Since the perforation Q is rust-prevented at the same time as attaching to the branch opening, the operation can be simplified. Further, the fluid flowing into the cylindrical body 41a from the perforation Q can communicate with the inside of the branching portion 12 and the cylindrical body 41a through the through hole 41c, so that a staying area of the fluid is formed. The fluid in the fluid pipe 1 and the housing 2 can be kept clean.

  Next, a branch opening communication method according to the third embodiment will be described with reference to FIGS. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted.

  As shown in FIG. 7 (a), as in the first embodiment, the valve lid 3 is connected to the tip of the insertion machine 38 and the insertion machine 38 is moved backward and branched via the work valve case 35. The valve lid 3 is removed from the part 12. Thereafter, as shown in FIG. 7B, the work valve case 35 is closed by the work valve 36, and the punching device 50 is connected above the work valve case 35 in place of the outer case 37.

  The perforating apparatus 50 is connected to a driving means (not shown) and extends in the axial direction in the branching section 12 toward the fluid pipe 1 and rotates around the axis, and a fluid fixedly attached to the tip of the shaft member 51. A cutter member 52 having a drilling blade 52a for drilling the tube 1 is mainly configured. The cutter member 52 is approached to the drilling Q to scrape the original drilling surface of the drilling Q to form a new drilling surface. To do. As a result, even if foreign matter such as rust adheres to the initial perforated surface of the perforated Q, this foreign matter can be removed.

  As in the second embodiment, the branch opening 12 is hermetically closed by the closing body 40, and the rust prevention member 41b of the rust prevention portion 41 contacts the inner peripheral surface of the piercing Q, thereby preventing the piercing Q from rusting. (See FIGS. 5 and 6).

  According to this, even if impurities such as rust are generated on the original perforated surface by cutting the original perforated surface of the perforated Q before rust prevention of the perforated Q, this foreign matter It is possible to rust prevent the new perforated surface from which is removed, and to keep the fluid pipe 1 and the housing 2 clean.

  Next, a branch opening communication method according to the fourth embodiment will be described with reference to FIGS. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted.

  As shown in FIG. 8, an appropriate member can be attached via a bolt / nut 18 at the end of the insertion machine 38 ′ of the present embodiment, and a flange portion 38 a projecting in the outer diameter direction is formed. Yes. Further, the closing body 40 'of the present embodiment has a rust prevention portion 41 extending toward the perforation Q, and extends toward the perforation Q in the same direction as the second embodiment. The flange portion 42 has an end projecting in the outer diameter direction. In addition, the male screw portion 20c of the plug member 20 is attached to the communication hole 4a 'in advance by being screwed into the female screw portion 14a on the inner peripheral surface of the communication hole 4a'. As shown in the enclosure of FIG. 9, the plug member 20 includes a convex portion 20 b that protrudes upward, has a convex shape in sectional view, and has an engaging concave portion 20 a that opens in the outer diameter direction. Is provided.

  First, as shown in FIG. 8, the flange portion 42 and the flange portion 38 a are connected via the bolt and nut 18, and the insertion machine 38 ′ is moved forward as in the first and second embodiments. As a result, as shown in FIG. 9, the closing body 40 'is attached to the branch portion 12, and the branch opening 12b is closed in a sealed manner. At this time, the rust prevention member 41 b of the rust prevention portion 41 rusts the perforation Q by coming into contact with the inner peripheral surface of the perforation Q. In addition, before attaching obstruction | occlusion body 40 'to the branch part 12 in this way, as demonstrated in the said Example 3, the original drilling surface of the drilling Q is shaved with a cutter member, and a new drilling surface is formed. You may do it.

  In this state, the fluid that has flowed out of the perforation Q does not flow out of the casing 2 and the closing body 40 ', so the work valve case 35 and the outer case 37 in which the insertion machine 38' is disposed are removed. be able to. After removing the working valve case 35 and the outer case 37 in which the insertion machine 38 ′ is disposed, as shown in FIG. 9, the repair valve 21 is provided with the repair valve 21 in the flange portion 42 of the closing body 40 ′. While attaching the case 23, the lid | cover case 24 provided with the removal tool 25 for removing the plug member 20 above the repair valve case 23 is arrange | positioned.

  The detachment tool 25 is inserted into the lid case 24, and is provided at the shaft portion 25a that can be advanced and retracted toward the communication hole 4a ′, and at the tip portion of the shaft portion 25a, and can be fitted to the convex portion 20b of the plug member 20. And a gripping portion 25c provided at the rear end portion of the shaft portion 25a and gripped and operated by the operator. The shaft portion 25a can be advanced and retracted via the repair valve case 23 by the operator holding the grip portion 25c and pushing down or pulling up the communication hole 4a ′. It can be rotated around its axis by gripping 25c and appropriately rotating it. Moreover, the fitting part 25b has the engagement bolt 26 for engaging with the engagement recessed part 20a in the state fitted to the convex part 20b of the plug member 20, and this engagement bolt 26 is engaged. An engagement end portion 26a that is biased in the inner diameter direction by an elastic member (not shown) is provided toward the concave portion 20a.

  After the lid case 24 having the removal tool 25 is disposed above the repair valve case 23, the operator grips the grip portion 25c, pushes down the removal tool 25 toward the communication hole 4a ', and moves the fitting portion 25b. It is made to fit in the convex part 20b of the plug member 20. At this time, the engagement end portion 26a of the engagement bolt 26 slides while being urged by the outer peripheral surface of the convex portion 20b, and when the engagement end portion 26a eventually moves to the position of the engagement concave portion 20a, an elastic restoring force is obtained. Is housed in the engaging recess 20a (see the enclosure in FIG. 9), and the removal tool 25 and the plug member 20 are engaged. Then, after the operator holds the grip portion 25c and rotates the removal tool 25 around the shaft portion 25a, the screwing of the male screw portion 20c and the female screw portion 14a of the plug member 20 is released. By removing the removal tool 25, the plug member 20 is removed from the communication hole 4a '.

  Thereby, as shown in FIG. 10, the communication hole 4 a ′ communicates with the repair valve case 23. Thereafter, the repair valve case 23 is closed by the repair valve 21, the lid case 24 and the removal tool 25 are removed, and a fire hydrant 61 which is a connecting member of this embodiment is attached. Then, the repair valve case 23 is opened by the repair valve 21, and the fluid flowing from the perforation Q can be appropriately discharged to the outside by the operator operating the plug member of the fire hydrant 61.

  The engagement end 26a of the engagement bolt 26 of this embodiment is urged in the inner diameter direction by an elastic member (not shown). However, the present invention is not limited to this, and the engagement end itself has elasticity. It may be attached to the engagement bolt. Further, the removal tool is not limited to this, and any removal tool may be used as long as the plug member can be removed by an external operation.

  Next, a branch opening communication method according to the fifth embodiment will be described with reference to FIGS. 11 and 12. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted.

  As shown in FIG. 11A, the perforation Q ′ in the present embodiment is perforated by a cutter member (not shown), and the width dimension in the pipe circumferential direction is the width in the pipe axis direction above the fluid pipe 1. It is formed in a substantially rectangular shape in a top view that is longer than the dimensions. In addition, the above-mentioned perforation may be perforated by an end mill, for example. The housing 2 ′ is disposed over the rubber ring 22 ′ disposed along the outer periphery of the perforation Q ′ and the substantially entire length of the fluid tube 1 in the tube axis direction, and is continuously illustrated (not shown). And a seal member 32 disposed over substantially the entire circumference of both ends in the tube axis direction. The first casing 11a ′ and the second casing 11b ′ are tightened with bolts and nuts to tighten the fluid. The tube 1 is attached in a sealed manner. Further, a valve lid 3 ′ (closing body) for sealingly closing the branch opening 12b ′ is attached to the branch portion 12 ′. The valve lid 3 ′ moves forward and backward toward the perforation Q ′. A valve body 5 ′ for opening and closing the inside of the fluid pipe 1 through the perforation Q ′ is provided.

  Further, as shown in FIG. 12, the closing body 140 of this embodiment has a cylindrical portion 140a extending in a substantially cylindrical shape in the same direction as the branch portion 12 ′, and the perforation Q of the cylindrical portion 140a. The end portion on the “side” is an annular rust prevention portion 141 that comes into contact with the inner peripheral surface of the perforation Q ′. A rust preventive member 141 a is disposed on the outer peripheral surface of the rust preventive portion 141. The cylindrical portion 140a is formed with a connection portion 140b that can be connected to the upper flange 12a 'of the branch portion 12' when the closing body 140 is attached to the branch portion 12 '.

  As shown in FIG. 11 (b), the valve lid 3 'and the valve body 5' are removed from the branch portion 12 'by the insertion machine 38 through the same process as in the above embodiment. Next, as shown in FIG. 12 (a), instead of the valve lid 3 ', a closing body 140 to which the repair valve case 23 and the fire hydrant 61 are connected is attached to the distal end of the insertion machine 38, and the insertion machine 38 is perforated. Move forward toward Q '. Thereby, as shown in FIG. 12B, the closing body 140 is attached to the branch portion 12 ', and the branch opening 12b' is closed in a sealed manner. At this time, the rust preventive member 141a of the rust preventive part 141 rusts the perforations Q by coming into contact with the inner peripheral surface of the perforations Q. Then, the connecting portion 140b and the upper flange 12a 'are fastened with a bolt that is a locking portion of the present invention, whereby the closing body 140 is fixed to the branch portion 12', and the operation in the branch opening communication method is completed.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the said Example, although the air valve 6 and the fire hydrant 61 are applied as a connection member connected to the communicating hole of a closure body, a connection member is not restricted to these, For example, a ball valve, a sluice valve, A butterfly valve, a three-way valve, a drain, or the like may be used as long as the communication hole of the closing body can be opened and closed.

  In addition, the existing closing body that can be replaced with the closing body of the present invention is not limited to the valve lids 3 and 3 ′ of the above-described embodiment, and may be, for example, an inner lid that is installed in the branch portion and closes the branch opening. What is necessary is just to close the branch opening in a sealed manner.

  In the above embodiment, the locking portion is described as the fixing bolt 16. However, for example, the locking portion may be provided to be able to be locked to the closing body from the inner peripheral surface of the branching portion. It does not matter if it is made.

1 Fluid pipe 2, 2 'housing 3, 3' valve lid (closed body)
4 Closure 4a, 4a 'Communication hole 6 Air valve (connecting member)
12, 12 'Branching part 12b, 12b' Branching opening 16 Fixing bolt (locking part)
35 Working valve case (case body)
40, 40 ', 140 Closure body 41, 141 Rust prevention part 41b, 141a Rust prevention member 61 Fire hydrant (connection member)

Claims (4)

In a casing having a branch portion that is hermetically attached to a fluid pipe having a perforation and communicates with the perforation, the branch opening in which the branch opening is closed by a closing body can be communicated in an uninterrupted state. A branch opening communication method,
A case body that communicates with the branch portion is attached in a sealed manner, and after the closure body is removed through the case body,
In place of the closing body, a closing body having a communication hole communicating with the inside and outside of the branching portion is attached via the case body so that a contact portion is sealed with respect to the branching portion. Thus, a branch opening communication method characterized in that a connection member capable of opening and closing the communication hole can be attached to the communication hole.   The said closing body has the cyclic | annular rust prevention part contact | abutted to the said perforation, It attaches to the said branch opening, The said perforation is rusted by this rust prevention part, It is characterized by the above-mentioned. The branch opening communication method described.   The branch opening communication method according to claim 2, wherein the perforation surface of the perforation is cut before the perforation is rust-prevented.   The branch opening communication method according to any one of claims 1 to 3, wherein after the closure body is attached to the branch portion, the branch body is locked by a locking portion of the branch portion.

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